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241. Re: [TenTec] Corsair CW question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 26 Mar 2011 22:24:36 +0000; Chris, Is the receiver silent in ALL positions of the filter switch? 73, Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.; /archives//html/TenTec/2011-03/msg00293.html (8,346 bytes)
242. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 06 Apr 2011 22:25:10 +0100; Barry, When you say "all four" digits, I presume you mean the 100kHz, 10kHz, 1kHz and 100Hz digit positions? They are driven by a multiplex arrangement where the same segment in all digit positions i; /archives//html/TenTec/2011-04/msg00105.html (9,490 bytes)
243. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 06 Apr 2011 22:30:59 +0100; The path you need to check is: Pin 17 of U2 on the 81247 Display Driver board R14 on the 81247 Display Driver board Links between the 81247 Display Driver board and the 81248 Display Board 73, Steve; /archives//html/TenTec/2011-04/msg00107.html (8,167 bytes)
244. Re: [TenTec] Corsair - blank LED segments (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 06 Apr 2011 22:38:04 +0100; Barry, That is odd. I don't think it can be the 68705 because that doesn't operate down at the segment level. On the other hand the 10MHz and 1MHz positions are fed by completely separate driver chip; /archives//html/TenTec/2011-04/msg00108.html (9,813 bytes)
245. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:35:34 +0100; Correct - an EZNEC model of his antenna puts the feedpoint impedance at around 11-j930 Ohms No, that's wrong. A quarter wavelength of 600 Ohm line transforms 11-j930 to 4.5+j386. His 110ft of open wi; /archives//html/TenTec/2011-04/msg00140.html (9,036 bytes)
246. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:42:47 +0100; By the way, TLW predicts nearly 3dB loss in 110ft of 600 Ohm line on 160m with that length dipole; the loss would be even greater with commercial ladderline. My first move would be to lengthen the di; /archives//html/TenTec/2011-04/msg00142.html (8,183 bytes)
247. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 20:52:36 +0100; Irrespective of the matching problem, such a short dipole is going to give you very significant losses in the feedline. If you could lengthen the dipole to 200ft, TLW predicts the open-wire loss woul; /archives//html/TenTec/2011-04/msg00145.html (7,874 bytes)
248. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 21:33:31 +0100; Mike, Yes, it's a very popular "Ham Myth" - not helped by various articles in QST. TLW is the software supplied by ARRL with the Antenna Book. It calculates the losses and impedance transformations f; /archives//html/TenTec/2011-04/msg00148.html (9,843 bytes)
249. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 21:46:26 +0100; Art, If you mean extending the ends off at 90 degrees to the main dipole at the 25ft/30ft level, that's fine. Just think of it as adding end capacity loading to an electrically short dipole. The impo; /archives//html/TenTec/2011-04/msg00149.html (9,431 bytes)
250. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:11:51 +0100; Mike, You're putting words in my mouth - I've not said anything about whether an antenna is "half decent" or not. What I can tell you for sure is that a 132ft dipole at 50ft above average ground will; /archives//html/TenTec/2011-04/msg00152.html (10,418 bytes)
251. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:27:37 +0100; No - it also uses the earth model to generate feedpoint impedances. You only have to see the effect that soil type has on the impedance to realise that is true. You need to be careful with verticals; /archives//html/TenTec/2011-04/msg00158.html (9,489 bytes)
252. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:39:00 +0100; It not only wont read that high - it's probably calibrated for a 50 Ohm system not a 400 Ohm system ;) 73, Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@conte; /archives//html/TenTec/2011-04/msg00162.html (11,101 bytes)
253. Re: [TenTec] SLIGHTLY OT (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 08 Apr 2011 22:51:39 +0100; Art, That's probably wise, if you're happy with its performance on the other bands! I, too, am "blessed" with a relatively small garden. When I got serious about 160m operation I went for a 40ft top-; /archives//html/TenTec/2011-04/msg00163.html (9,151 bytes)
254. Re: [TenTec] Smaller 20M Rohmbic Question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 11 Apr 2011 12:03:09 +0100; It models as having a gain of 8dBd and a half-power beamwidth of about +/- 30 degrees. Hope you can erect it in the direction you need ;) 73, Steve G3TXQ _____________________________________________; /archives//html/TenTec/2011-04/msg00197.html (7,046 bytes)
255. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 19:00:21 +0100; Jerry, I never understood that piece of Ham folklore, or should it be "Ham Myth" :) In a mixing arrangement comprising a 9MHz IF and a 5-5.5MHz LO, designed to cover 20m/75m, there is *NO* sideband i; /archives//html/TenTec/2011-04/msg00221.html (8,854 bytes)
256. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 20:35:33 +0100; Jerry, Sorry - you are quite wrong on this :) If you have a carrier at 9.000 and a tone at 9.0015, subtract 5.000 for 80m and you get carrier at 4.000 and a tone at 4.0015. *USB* both at the IF and a; /archives//html/TenTec/2011-04/msg00223.html (10,507 bytes)
257. Re: [TenTec] Corsair question (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 16 Apr 2011 20:57:17 +0100; Jerry, It's a mistake to confuse the simple "9MHz IF with 5-5.5MHz LO" mixing scheme with the one used in the Corsair. In the Corsair we have: RF = LO - IF for all bands 160m thru 30m, and RF = LO +; /archives//html/TenTec/2011-04/msg00224.html (8,250 bytes)
258. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 14:30:55 +0100; Barry, That sounds right. U2A is included as an audio phase inverter - that allows *full-wave* rectification of the audio using the D6/D7 + D8/D9 diode pairs. Full-wave rectification provides a faste; /archives//html/TenTec/2011-04/msg00299.html (9,752 bytes)
259. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 14:36:21 +0100; By the way, my schematic misses out the positive rail which the emitter of Q9 and the R49/R47 junction connect to! For fault finding purposes, that part of my schematic is annotated with three typica; /archives//html/TenTec/2011-04/msg00300.html (8,938 bytes)
260. Re: [TenTec] Corsair II AGC circuit (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 23 Apr 2011 16:51:22 +0100; I agree - and that's why I've tried to replicate it on my OmniVI: http://www.karinya.net/g3txq/hang_agc/ 73, Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@con; /archives//html/TenTec/2011-04/msg00303.html (8,163 bytes)

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